Secondary sidearm for 4th century centurion

[Robert Vermaat]

What about those rather wicked Iberian 'skinning knives' with the fancy openwork sheaths? They're very nice.

Absolutely. I'll try later to dig up a nice picture of that one. they are worn only very local though, so you'd have to take care which impression you would want to do. I don't think it would suit a centenarius on the Rhine or in the East. Perhaps not even outside Spain.